Designed air purifier reactor for photocatalytic degradation of CO2 and NO2 gases using MWCNT/TiO2 thin films under visible light irradiation

Darvish, S. Mohammad; Ali, A. Morteza; Sani, S. Ramezani

doi:10.1016/j.matchemphys.2020.122872

Cited by 13 publications

(3 citation statements)

References 37 publications

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“…Transparency of the photocatalyst is a favorable property for practical applications such as glass windows and tiles. In this regards, utilizing the additives like carbon-based materials which reduce the transparency is limited [32]. Then, the transparency of the SiO 2 -TiO 2 layers is enumerated as another practical advantage.…”

Section: Introductionmentioning

confidence: 99%

Enhanced visible light photocatalytic activity of nanostructured SiO₂-TiO₂ thin films through optimizing thickness

Darvish,

Masoudi,

Mortezaali

et al. 2023

Phys. Scr.

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Thin films of silicon dioxide-titanium dioxide (SiO2-TiO2) with different thicknesses were deposited by a simple dip-coating method in a repetition behavior followed by heating processes. Choosing the optimum thickness is accounted as an approach for improving photocatalytic and hydrophilicity properties of a thin film. The obtained results from FESEM and AFM characterizations showed that with increasing thickness, the surface roughness increases from 3.089nm to 132.8nm. The XRD patterns indicate the presence of anatase phase for the SiO2-TiO2 thin film. Optical measurements were used to calculate thickness, generation rate of photocarriers, band gap, and refractive index of the samples. Decrease of band gap with increasing thickness makes the layer more proper for photocatalytic activity under visible light. It is obtained that the generation rate of carriers has the highest value (17.16×1024 m-3s-1) for the thickness of 336 nm. PL spectra for the thickness of 336 nm confirmed the presence of defects which reduce the recombination rate and improve charge carrier separation. XPS was used to distinguish the chemical composition. Variation of defect concentrations, number of grain boundaries, and surface roughness with thickness were considered as the main parameters affecting the photocatalytic performance. The highest photodegradation was obtained for 336 nm thick film under illumination of visible light (100% degradation of 40 ml solution of 10 mg/L methylene blue (MB)). This research provides a systematic study on the structural and optical properties of the different thick SiO2-TiO2 films with goal of enhancing photocatalytic activity in the visible light region.

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Section: Introductionmentioning

confidence: 99%

Enhanced visible light photocatalytic activity of nanostructured SiO₂-TiO₂ thin films through optimizing thickness

Darvish,

Masoudi,

Mortezaali

et al. 2023

Phys. Scr.

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“…Lastly, the air quality improvement strategy "III" is based on the degradation of pollutant species via a chemical reaction mechanism. In the last decade, the depollution structures made of the integration of photocatalyst semiconductor oxides such as titanium dioxide (TiO 2 ) and zinc oxide (ZnO) in construction materials or as direct use on a surface layer, have been used to remove various pollutants (O3, COx, NOx, VOCs) (Le Pivert et al, 2021;Darvish et al, 2020;Le Pivert et al, 2020;Binas et al, 2017). The func-tioning of these panels relies on the photocatalysis mechanism.…”

Section: Introductionmentioning

confidence: 99%

Smart Placement of Depolluting Panels in Urban Areas as Regards of Air Flow Using Adjoint Framework and District Digital Twin

Hamada,

Chabi,

Chakir

et al. 2023

Preprint

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“…Titanium dioxide (TiO 2 ), as a photocatalytic semiconductor material with stable performance, low price, non-toxic and pollution-free, has attracted extensive attentions in scientific research [1][2][3]. In 1972, the photocatalytic property of TiO 2 was first reported by Japanese scientists Fujishima and Honda [4,5], and it has gradually been widely used in the field of air purification [6][7][8] and sewage treatment [9][10][11]. However, the large band gap energy (3.2 eV) and the easy closure of electron-holes of TiO 2 lead to poor catalytic effect in visible light.…”

Section: Introductionmentioning

confidence: 99%

Preparation of N-TiO₂/SiO₂ composites by solvothermal method and their photocatalytic properties

Dong

Wang

et al. 2022

Mater. Res. Express

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In order to improve the visible light catalytic activity of titanium dioxide (TiO2) and ensure its long-term stability on the surface of concrete, an N-TiO2/SiO2 composite was prepared using tetrabutyl titanate, nitric acid, and modified SiO2 nanospheres as the precursors by a solvothermal method. The effect of nitric acid on the phase composition, morphology and photoelectric properties of the synthesized photocatalytic composites was systematically studied by various characterization methods. The results show that the optimum nitric acid/butyl titanate volume ratio is 1/6. The nitrogen-doped TiO2 nanoparticles were uniformly dispersed on the surface of spherical SiO2 with a diameter of 200 nm. The degradation rate of simulated pollutants (RhB) with pH 5 and 7 exceeded 95% within 30 minutes and the catalytic effect remained excellent after five repetitions without much weakening. The excellent visible photocatalytic performance can be attributed to the doping of N replacing part of the oxygen atoms in TiO2, forming the energy level of N 2p at the O 2p energy level and reducing the TiO2 energy band gap to 2.99 eV. At the same time, the better dispersion of N-TiO2/SiO2 prepared by this new synthesis method also plays an important role in the improvement of visible light photocatalytic activity.

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Designed air purifier reactor for photocatalytic degradation of CO2 and NO2 gases using MWCNT/TiO2 thin films under visible light irradiation

Cited by 13 publications

References 37 publications

Enhanced visible light photocatalytic activity of nanostructured SiO₂-TiO₂ thin films through optimizing thickness

Enhanced visible light photocatalytic activity of nanostructured SiO₂-TiO₂ thin films through optimizing thickness

Smart Placement of Depolluting Panels in Urban Areas as Regards of Air Flow Using Adjoint Framework and District Digital Twin

Preparation of N-TiO₂/SiO₂ composites by solvothermal method and their photocatalytic properties

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Designed air purifier reactor for photocatalytic degradation of CO2 and NO2 gases using MWCNT/TiO2 thin films under visible light irradiation

Cited by 13 publications

References 37 publications

Enhanced visible light photocatalytic activity of nanostructured SiO2-TiO2 thin films through optimizing thickness

Enhanced visible light photocatalytic activity of nanostructured SiO2-TiO2 thin films through optimizing thickness

Smart Placement of Depolluting Panels in Urban Areas as Regards of Air Flow Using Adjoint Framework and District Digital Twin

Preparation of N-TiO2/SiO2 composites by solvothermal method and their photocatalytic properties

Contact Info

Product

Resources

About

Enhanced visible light photocatalytic activity of nanostructured SiO₂-TiO₂ thin films through optimizing thickness

Enhanced visible light photocatalytic activity of nanostructured SiO₂-TiO₂ thin films through optimizing thickness

Preparation of N-TiO₂/SiO₂ composites by solvothermal method and their photocatalytic properties